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Usgs wrir 03 4331 biological assessment of streams in the indianapolis metropolitan area indiana 1999 2001 brief method summary benthic invertebrate samples were collected by use of surber samplers that had a 00929 sq m sample grid and a collection net bag mesh opening of 210 um. Biological assessment of streams in the indianapolis metropolitan area indiana 1999 2001 by david c voelker prepared in cooperation with the indianapolis department of public works office of environmental services water resources investigations report 03 4331 us department of the interior us geological survey. Marion invert 1999 2001 voelker dc 2004 biological assessment of streams in the indianapolis metropolitan area indiana 1999 2001 us geological survey water resources investigations report 03 4331 48 p. A 1999 usgs study evaluated 6 tributaries to the white river in indianapolis metropolitan area that were affected by combined sewer overflow pollution each tributary had several sampling sites and stream qhei values ranged from 4 50 voelker 2004 biological assessment of streams in the indianapolis metropolitan area indiana 1999 2001